LetStmts in between loops over GPU blocks were being ignored...
LetStmts in between loops over GPU blocks were being ignored...

... for the purpose of computing shared memory size and gpu block size.
Resulted in missing symbol errors.


Former-commit-id: 967e9f82505e6af8211c04b426ccd6d2588de87d
Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide